and up to Karl Brugmann's 5-volume Grundriss (outline of Indo-European languages) published from 1886 to 1893. Brugmann's Neogrammarian re-evaluation of the field and Ferdinand de Saussure's proposal of the concept of "consonantal schwa" (which later evolved into the laryngeal theory) may be considered the beginning of "contemporary" Indo-European studies. The Indo-European proto-language as described in the early 1900s in its main aspects is still accepted today, and the work done in the 20th century has been cleaning up and systematizing, as well as the incorporation of new language material, notably the Anatolian and Tocharian branches unknown in the 19th century, into the Indo-European framework. Notably, the laryngeal theory, in its early forms barely noticed except as a clever analysis, became mainstream after the 1927 discovery by Jerzy Kuryłowicz of the survival of at least some of these hypothetical phonemes in Anatolian. Julius Pokorny in 1959 published his Indogermanisches etymologisches Wörterbuch, an updated and slimmed-down reworking of the three-volume Vergleichendes Wörterbuch der indogermanischen Sprachen of Alois Walde and Julius Pokorny (1927–32). Both of these works aim to provide an overview of the lexical knowledge accumulated until the early 20th century, but with only stray comments on the structure of individual forms; in Pokorny 1959, then-recent trends of morphology and phonology (e.g., the laryngeal theory), go unacknowledged, and he largely ignores Anatolian and Tocharian data. The generation of Indo-Europeanists active in the last third of the 20th century, such as Oswald Szemerényi, Calvert Watkins, Warren Cowgill, Jochem Schindler, Helmut Rix, developed a better understanding of morphology and, in the wake of Kuryłowicz's 1956 L'apophonie en indo-européen, ablaut. Rix's Lexikon der indogermanischen Verben appeared in 1997 as a first step towards a modernization of Pokorny's dictionary; corresponding tomes addressing the noun, Nomina im Indogermanischen Lexikon, appeared in 2008, and pronouns and particles, Lexikon der indogermanischen Partikeln und Pronominalstämme, in 2014. Current efforts are focused on a better understanding of the relative chronology within the proto-language, aiming at distinctions of "early", "middle" and "late", or "inner" and "outer" PIE dialects, but a general consensus has yet to form. From the 1960s, knowledge of Anatolian began to be of a certainty sufficient stage to allow it to influence the image of the proto-language (see also Indo-Hittite). Such attempts at recovering a sense of historical depth in PIE have been combined with efforts towards linking the history of the language with archaeology, notably with the Kurgan